How can I make indoor lighting less uniform?
I have decided to post my solution to the problem:


Always, if possible, make it so that something is occluding your light. That way, the shadows look nice.

From another angle:

Look at the bookcase in the bottom right of the image as a perfect demonstration of my example, as you can see the shadows intersecting from the lights either side of the bookcase.

Also, bloom and occlusion really complete the look. There is absolutely no way that the shot would look anywhere near as good without either one of them.